Effects of Heating Temperature and Additives on Phosphate Sorption Coefficient of Heated Materials from the Volcanic Ash Soils

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  • 火山灰土壌のリン酸吸収係数におよぼす焼成温度および添加物の影響
  • カザンバイ ドジョウ ノ リンサン キュウシュウ ケイスウ ニ オヨボス ショ

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The heating temperature and heating time of the volcanic ash soils were investigated in order to enlarge phosphate removing capacity of the volcanic ash soils. The effects of addition of ferrous sulfate (FeSO_4・7H_2O) and poly aluminum chloride (PAC) to the volcanic ash soils before heating on phosphate sorption coefficient were also studied. 1) Phosphate sorption coefficient of the heated volcanic ash soils increased with heating temperature till 500℃. While, high heating temperature (>600℃) extremely decreased the phosphate sorption coefficient. The heating time scarcely affected the phosphate sorption coefficient. The best condition of heating was at 400-500℃ for 5 min, judging from the phosphate sorption coefficient, the crumbliness in the water and the cost. 2) The addition of FeSO_4・7 H_2O to the volcanic ash soils increased better phosphate sorption coefficient of heated materials than no addition of FeSO_4・7H_2O. 3) The addition of PAC 4%, 8% to the volcanic ash soils increased phosphate sorption coefficient of heated materials. But the addition of PAC 16% to the volcanic ash soils scarcely affected phosphate sorption coefficient of heated materials.

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